Description Usage Arguments Value Note Author(s) References Examples

Given a start point, initial bearing (direction), and distance, this function computes the destination point travelling along a the shortest path on an ellipsoid (the geodesic).

1 |

`p` |
Longitude and Latitude of point(s), in degrees. Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object |

`b` |
numeric. Bearing (direction) in degrees |

`d` |
numeric. Distance in meters |

`a` |
major (equatorial) radius of the ellipsoid. The default value is for WGS84 |

`f` |
ellipsoid flattening. The default value is for WGS84 |

`...` |
additional arguments. If an argument 'r' is supplied, this is taken as the radius of the earth (e.g. 6378137 m) and computations are for a sphere (great circle) instead of an ellipsoid (geodetic). This is for backwards compatibility only |

A pair of coordinates (longitude/latitude)

Direction changes continuously when travelling along a geodesic. Therefore, the final direction is not the same as the initial direction. You can compute the final direction with `finalBearing`

(see examples, below)

This function calls GeographicLib code by C.F.F. Karney

C.F.F. Karney, 2013. Algorithms for geodesics, J. Geodesy 87: 43-55. https://dx.doi.org/10.1007/s00190-012-0578-z. Addenda: http://geographiclib.sf.net/geod-addenda.html. Also see http://geographiclib.sourceforge.net/

1 2 3 4 5 6 | ```
p <- cbind(5,52)
d <- destPoint(p,30,10000)
d
#final direction, when arriving at endpoint:
finalBearing(d, p)
``` |

```
Loading required package: sp
lon lat
[1,] 5.07293 52.07781
[1] -150
```

geosphere documentation built on Nov. 17, 2017, 4:59 a.m.

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